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Simply put, larger planets are easier to detect by pretty much all the methods we use for finding exoplanets. The two most successful methods are the transit method and the radial velocity method. The transit method involves detecting the drop in a star's apparent brightness as a planet passes in front of it and blocks a small amount of the light. Larger planets will obviously block more light. The radial velocity technique measures the "wobble" of the parent star caused by the planet's gravity. More massive planets will have stronger gravity and thus produce a larger wobble.

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